09 August 2007

It may seem strange that the emirate of Abu Dhabi, one of the planet's largest suppliers of oil, is planning to build the world's first carbon-neutral city.

But in fact, it makes a lot of financial sense. The 3.7-square-mile city, called Masdar, will cut its electricity bill by harnessing wind, solar, and geothermal energy, while a total ban on cars within city walls should reduce the long-term health costs associated with smog.

Masdar will be filled with shaded streets to encourage walking. A solar-powered transit system will take you to the airport.